I/O control system having a plurality of access enabling bits fo

Details I/O control system having a plurality of access enabling bits fo I/O control system having a plurality of access enabling bits fo

1992-06-02

1993-10-26

Lee, Thomas C.

Boots, shoes, and leggings

395800, 3642419, 3642842, 364DIG1, 36492795, G06F 1320, G06F 1300

Patent

active

052573532

ABSTRACT:
In an I/O port protection device, is described wherein accessing an I/O device is selectively controlled by a value of a bit stored in a bit map. A CPU instruction accessing a port is allowed direct access when the bit value for that port is a zero, but is trapped when the value is a one. A trapped instruction is either prohibited from any accessing or is rerouted for accessing a different I/O port.

REFERENCES:
patent: 4414626 (1983-11-01), Arai et al.
patent: 4695945 (1987-09-01), Irwin
patent: 4849931 (1989-07-01), Ishii et al.
patent: 4901274 (1990-02-01), Maejima et al.

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